Coating composition system, the preparation method, and the use thereof

Abstract

The present disclosure provides for a coating composition system suitable for forming a stain resistant and soft tactile texture coating onto a variety of substrate materials including plastic materials, metal materials, ceramic materials, and concrete materials. The coating composition system can be cured under mild curing conditions, and provides the resulting coating with excellent properties in terms of adhesion to the substrates, strength, and abrasion resistance. The present disclosure also provides for a method for preparing the coating composition system, and the use thereof.

What is claimed: 
     
       1. A method for forming a stain resistant and soft tactile texture coating onto a substrate, comprising the steps of:
 forming a primer coating onto the substrate with a first composition comprising:
 a hydroxyl resin selected from one or more of the group consisting of alkyd resins, acrylic resins, polyester resins, polyurethane resins, epoxy resins, and modified silicone resins; 
 a hardener resin having functional groups which react with hydroxyl groups of the hydroxyl resin; 
 wherein the molar ratio of the hydroxyl groups of the hydroxyl resin is controlled to be excessive over the molar ratio of the functional groups of the hardener resin; 
 
 forming a top coating onto the primer coating with a second composition comprising:
 an alkenyl containing polysiloxane of formula (I) 
 
 
       
         
           
           
               
               
           
         
         
           wherein 
           R represents an alkyl group having 1 to 8 carbon atoms, or an alkenyl group having 2 to 10 carbon atoms; 
           R 1  and R 3  each independently represents an alkyl group having 1 to 8 carbon atoms; 
           R 2  represents an alkenyl group having 2 to 10 carbon atoms; 
           l+m+n+a is within the range from 200 to 15000; 
           wherein the alkenyl content of the alkenyl-containing polysiloxane is not less than 0.2 mmol/g and not greater than 5.0 mmol/g; 
           a Si—H bond containing polysiloxane of the formula (II) 
         
       
       
         
           
           
               
               
           
         
         
           wherein 
           R 4  and R 5  each independently represents an alkyl group having 1 to 8 carbon atoms; 
           R 6  represents an alkyl group having 1 to 8 carbon atoms, or H; 
           o+p+q+b is within the range from 5 to 500; 
           a catalyst selected from one or more of the group consisting of platinum compounds, palladium compounds, rhodium compounds and ruthenium compounds. 
         
       
     
     
       2. The method according to  claim 1 , wherein the hardener of the first composition is selected from one or more of the group consisting of amino resins, isocyanates, and melamine resins. 
     
     
       3. The method according to  claim 1 , wherein a catalyst selected from one or more of the group consisting of organic cobalt catalysts, manganese catalysts, and organic tin catalysts is added into the first composition. 
     
     
       4. The method according to  claim 3 , wherein the amount of the catalyst is controlled to be within the range from 0 to 2.5 wt % in relation to the total weight of the hydroxyl resin. 
     
     
       5. The method according to  claim 1 , wherein an adhesion promoter selected from one or more of the group consisting of epoxy silanes, amino silanes, alkenyl silanes, titanate, zirconate, aluminate, polymers with a hydroxyl value of from 100 to 300 mgKOH/g or an acid value of from 20 to 200 mgKOH/g is added into the first composition. 
     
     
       6. The method according to  claim 1 , wherein the catalyst in the second composition is added in an amount within the range from 0.1 to 2.5 wt % in relation to the total weight of the alkenyl containing polysiloxane and the Si—H bond containing polysiloxane. 
     
     
       7. The method according to  claim 1 , wherein a hydrosilication inhibitor selected from one or more of the group consisting of alkynols and their derivatives, multi-alkenyl polysiloxanes, cyclic alkenyl silanes, amides, and maleates is further added into the second composition. 
     
     
       8. The method according to  claim 7 , wherein the amount of the hydrosilication inhibitor is controlled to be within the range from 0% to 5.0% % in relation to the total weight of the alkenyl containing polysiloxane and the Si—H bond containing polysiloxane.